Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac110bedff8163f…

MALICIOUS

PDF

91.4 KB Created: 2021-07-15 18:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a308607d77cbbba7d2196b91aeffd1b SHA-1: 259546acff03a296a89edfd64e7074c3b8b6d309 SHA-256: 9ac110bedff8163f87946f93b5a4737106c606fef13d4f203037da8706302d9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d52d4572e261e9af23d7e6570778c63a/jotatenejefefo.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/54245308453.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/6615610560.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99e47c7ea---15407690094.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/60979294973.pdfIn PDF document text
    • http://novichiha.ru/pic/file/rozuzufuperifetika.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/jabelejodaxurumelabum.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/38485187979.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/manip.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/da867iqdf5v5uk1scg7b290i2f/53489051340.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/timorexidanizexofasip.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9d51ddb9---balivumab.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/puxijugefijibawadamesal.pdfIn PDF document text
    • http://debden.org/userfiles/file/43565889597.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160945d3284ae3---ratanuvinapaxixubapos.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff840d860---92783969603.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a297c25e723---tumebilimovovi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/55269220826.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4fd54bf4bfc6522003398ee5bf320e9f/sazovitarunafi.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/20927148136.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sajasegasazezofurimu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/39d8f613343b2b70f2375dc2d4465c2c/87173600375.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e18379a0d---wijinajid.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/62o9q4h4giidtacanp2gro76us/suzazezaxufelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=repost+a+storyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10160 bytes
SHA-256: f1400d50699665a946474826d0163fb2a376badec1a6c392ecf46b84efa65abd
font_01_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 18552 bytes
SHA-256: a267ad908a4e47dde0bcaf9628d22a9150aef3344c9f26c5b6c28397f7a717e6
font_02_sfnt_off000148ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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